Update website/pages/upgrade-guides/v16-v17.mdx

Co-authored-by: Yaacov Rydzinski  <[email protected]>

Author: JoviDeCroock

website/pages/upgrade-guides/v16-v17.mdx

@@ -136,7 +136,7 @@ See https://github.com/graphql/graphql-js/pull/4322
 
 - Deprecated  `astFromValue` use `valueToLiteral` instead, when leveraging `valueToLiteral` ensure
   that you are working with externally provided values i.e. the SDL provided defaultValue to a variable.
-- Deprecated `valueFormAST` use `coerceInputLiteral` instead
+- Deprecated `valueFromAST` use `coerceInputLiteral` instead
 
 ## New Features